Aomi Transact
majiayu000/claude-skill-registry
Build natural-language crypto/DeFi agents and EVM MCP plugins (Claude Code, Cursor, Codex, Gemini).
DeFi legos and protocol composability on Ethereum and L2s. An agent skill from austintgriffith/ethskills.
Install Building Blocks
$ npx skills add austintgriffith/ethskills --skill building-blocks -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install austintgriffith/ethskills building-blocks --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/austintgriffith/ethskills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/building-blocks .claude/skills/building-blocks && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "building-blocks" agent skill from https://github.com/austintgriffith/ethskills/tree/master/building-blocks into .claude/skills/building-blocks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-blocks", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/austintgriffith/ethskills/tree/master/building-blocksType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add austintgriffith/ethskills --skill building-blocks -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install austintgriffith/ethskills building-blocks --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/austintgriffith/ethskills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/building-blocks .agents/skills/building-blocks && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "building-blocks" agent skill from https://github.com/austintgriffith/ethskills/tree/master/building-blocks into .agents/skills/building-blocks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-blocks", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add austintgriffith/ethskills --skill building-blocks -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install austintgriffith/ethskills building-blocks --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/austintgriffith/ethskills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/building-blocks .cursor/skills/building-blocks && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "building-blocks" agent skill from https://github.com/austintgriffith/ethskills/tree/master/building-blocks into .cursor/skills/building-blocks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-blocks", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/austintgriffith/ethskills.git --path building-blocks--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add austintgriffith/ethskills --skill building-blocks -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install austintgriffith/ethskills building-blocks --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/austintgriffith/ethskills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/building-blocks .gemini/skills/building-blocks && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "building-blocks" agent skill from https://github.com/austintgriffith/ethskills/tree/master/building-blocks into .gemini/skills/building-blocks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-blocks", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install austintgriffith/ethskills building-blocksInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add austintgriffith/ethskills --skill building-blocks -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/austintgriffith/ethskills.git skills-src && mkdir -p .github/skills && cp -r skills-src/building-blocks .github/skills/building-blocks && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "building-blocks" agent skill from https://github.com/austintgriffith/ethskills/tree/master/building-blocks into .github/skills/building-blocks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-blocks", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add austintgriffith/ethskills --skill building-blocks -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install austintgriffith/ethskills building-blocks --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/austintgriffith/ethskills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/building-blocks .opencode/skills/building-blocks && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "building-blocks" agent skill from https://github.com/austintgriffith/ethskills/tree/master/building-blocks into .opencode/skills/building-blocks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-blocks", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
building-blocks- GitHub stars
- 294
- Token cost
- ~2.9k tokens
- SKILL.md length
- 885 words
- Files
- 1
- Skills in repo
- 22
- Repo updated
- First seen
- Licence
- None found
At a glance
DeFi legos and protocol composability on Ethereum and L2s. An agent skill from austintgriffith/ethskills.
- Works in 4 steps: SY (Standardized Yield): Wraps any… → PT (Principal Token): The principal.… → YT (Yield Token): All yield until… → …
- Building DeFi integrations
- SKILL.md covers What You Probably Got Wrong, Key Protocol Addresses…, Uniswap V4 Hooks (New) and Composability Patterns…, plus 4 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Building Blocks is an agent skill from austintgriffith/ethskills. DeFi legos and protocol composability on Ethereum and L2s. Major protocols per chain — Aerodrome on Base, GMX/Pendle on Arbitrum, Velodrome on Optimism — plus mainnet primitives (Uniswap, Aave, Compound, Curve). How they work, how to build on them, and how to combine them. Use when building DeFi integrations, choosing protocols on a specific L2, designing yield strategies, or composing existing protocols into something new.
Its SKILL.md is about 2.9k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Business, Finance & HR, covering Crypto and DeFi analysis. It works with Uniswap, Arbitrum and Ethereum. The repository describes itself as: The missing knowledge between AI agents and production Ethereum.
When your agent uses it
- Building DeFi integrations
- Choosing protocols on a specific L2
- Designing yield strategies
- Composing existing protocols into something new
Example prompts
- “/building-blocks”
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- SY (Standardized Yield): Wraps any yield-bearing asset. E.g., wstETH → SY-wstETH.
- PT (Principal Token): The principal. Redeemable 1:1 at maturity. Trades at a discount (discount = implied yield).
- YT (Yield Token): All yield until maturity. Value decays to 0 at maturity.
- Core invariant: SY_value = PT_value + YT_value
What it can do on your machine
Read from SKILL.md and the folder at commit 06ea4ef. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are solidity).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
defillama.comdune.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Building Blocks loads about 2.9k tokens when it runs. Until then it costs about 111 tokens; SKILL.md has 885 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 885 words (~2,889 tokens).
“DeFi TVL: Check DeFi Llama for current Ethereum DeFi TVL. If you're quoting numbers from 2023-2024, they're stale.”
- name
- building-blocks
Files
Just SKILL.md in building-blocks of austintgriffith/ethskills.
Open the folder on GitHubat commit 06ea4ef
Compare with similar skills
Building Blocks next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Building Blocks this skillaustintgriffith/ethskills | 294 | — | ~2.9k | Automated safety check: Pass | None | |
| Aomi Transactmajiayu000/claude-skill-registry | 666 | 2 repos | ~2.3k | Automated safety check: Pass | MIT | |
| Swapper Depositswapperfinance/swapper-toolkit | 852 | — | ~1.8k | Automated safety check: Pass | MIT | |
| SurfBlockRunAI/ClawRouter | 6.6k | — | ~4k | Automated safety check: Pass | MIT | |
| Notebook To Strategytradingstrategy-ai/trade-executor | 160 | — | ~1.1k | Automated safety check: Pass | Custom licence | |
| ZyfaiBankrBot/skills | 1.2k | 1 repos | ~6.8k | Automated safety check: Pass | None |
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Related
Categories
Questions about Building Blocks
What does Building Blocks do?
DeFi legos and protocol composability on Ethereum and L2s. An agent skill from austintgriffith/ethskills. Building Blocks is an agent skill from austintgriffith/ethskills. DeFi legos and protocol composability on Ethereum and L2s.
When should I use Building Blocks?
Building Blocks fits situations like: building DeFi integrations; choosing protocols on a specific L2; designing yield strategies; composing existing protocols into something new.
How do I install Building Blocks in Claude Code?
Run `npx skills add austintgriffith/ethskills --skill building-blocks -a claude-code`. Or copy the skill folder (building-blocks in austintgriffith/ethskills) into .claude/skills/building-blocks in your project. Claude Code loads it when a task matches its description.
How do I install Building Blocks in Codex?
Run `npx skills add austintgriffith/ethskills --skill building-blocks -a codex`. Or copy the skill folder (building-blocks in austintgriffith/ethskills) into .agents/skills/building-blocks in your project. Codex loads it when a task matches its description.
Can I use Building Blocks in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add austintgriffith/ethskills --skill building-blocks -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/building-blocks, .gemini/skills/building-blocks, .github/skills/building-blocks and .opencode/skills/building-blocks in your project.
What does Building Blocks need to run?
SKILL.md names no scripts, command-line tools or credentials: Building Blocks is instructions for the agent only.
Does Building Blocks access the network?
SKILL.md names 2 domains. As links in the text: defillama.com and dune.com. This is read from the text; nothing was executed.
Is Building Blocks safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Building Blocks use?
No licence was found for Building Blocks or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Building Blocks use?
About 2.9k tokens (SKILL.md is roughly 12k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Building Blocks?
Skills that share tags, products or a category with Building Blocks: Aomi Transact (majiayu000/claude-skill-registry, 666 stars), Swapper Deposit (swapperfinance/swapper-toolkit, 852 stars), Surf (BlockRunAI/ClawRouter, 6.6k stars) and Notebook To Strategy (tradingstrategy-ai/trade-executor, 160 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Building Blocks?
austintgriffith (a GitHub user) maintains it in austintgriffith/ethskills, which has 294 GitHub stars. The repository holds 22 skills in this directory. The repository was last updated on August 20, 2026.
Source: austintgriffith/ethskills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.